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/*
* Copyright 2014 Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onosproject.store.service;
import static com.google.common.base.Preconditions.checkArgument;
import java.util.Objects;
import org.onosproject.store.Timestamp;
import com.google.common.base.MoreObjects;
import com.google.common.collect.ComparisonChain;
/**
* A Timestamp that derives its value from the prevailing
* wallclock time on the controller where it is generated.
*/
public class WallClockTimestamp implements Timestamp {
private final long unixTimestamp;
public WallClockTimestamp() {
unixTimestamp = System.currentTimeMillis();
}
public WallClockTimestamp(long timestamp) {
unixTimestamp = timestamp;
}
@Override
public int compareTo(Timestamp o) {
checkArgument(o instanceof WallClockTimestamp,
"Must be WallClockTimestamp", o);
WallClockTimestamp that = (WallClockTimestamp) o;
return ComparisonChain.start()
.compare(this.unixTimestamp, that.unixTimestamp)
.result();
}
@Override
public int hashCode() {
return Long.hashCode(unixTimestamp);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof WallClockTimestamp)) {
return false;
}
WallClockTimestamp that = (WallClockTimestamp) obj;
return Objects.equals(this.unixTimestamp, that.unixTimestamp);
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("unixTimestamp", unixTimestamp)
.toString();
}
/**
* Returns the unixTimestamp.
*
* @return unix timestamp
*/
public long unixTimestamp() {
return unixTimestamp;
}
}
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